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Z8631904PSC Datasheet(PDF) 10 Page - Zilog, Inc.

Part # Z8631904PSC
Description  PS/2 MOUSE CONTROLLER
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z8631904PSC Datasheet(HTML) 10 Page - Zilog, Inc.

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Z86319
PS/2 Mouse Controller
Zilog
10
P R E L I M I N A R Y
DS97KEY1605
PIN FUNCTIONS (Continued)
Port 2 (P27-P20). Port 2 is an 8-bit, bit programmable, bi-
directional, CMOS-compatible I/O port. These eight I/O
lines can be configured under software control to be input
or output, independently. Bits programmed as outputs
may be globally programmed as either push-pull or open-
drain. When configured as inputs, P20 and P22 have 10
kOhm (typical) pull-up resistors (Figure 9). However, P21
and P23 do not have resistors (Figure 10).
When configured as inputs, P24-P27 are configured with a
voltage divider. The voltage divider consists of an internal
25K pull-up resistor (Figure 11), and a 7.5K pull-down re-
sistor. The input levels on P24-P27 are adjusted for con-
nection to the emitters of the opto-transistors and switch at
a voltage level of 0.4 VDD (± 300 mV). For input voltages
on P24-P27, refer to Table 3.
Table 3. P24-P27 Input Open Circuit Voltage
(No off-chip resistance)
VDD
Min
Max
4.5V
0.95V
1.15V
5.0V
1.05V
1.25V
5.5V
1.15V
1.39V
Figure 9. Port 2 P20, P22 Configuration
OE
Out
In
Open-Drain
VDD
Pad
10 Kohm,
±20%


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